Picture frame



FIG. 1 is a front elevational view of a picture frame showing my new design;

FIG. 2 is a right side elevational view thereof, the side opposite being substantially a mirror image;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a fragmentary view of a corner member of the design of FIG. 1 shown on an enlarged scale;

FIG. 5 is a right side elevational view thereof; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a picture frame, as shown and described. 